Kinetics of Tritium Release from Thermal Neutron-Irradiated Li0.17Pb0.83

• Published in: Fusion science and technology Vol. 62; no. 1; pp. 56 - 60
• Main Authors: Kobayashi, Makoto, Hamada, Akiko, Matsuoka, Katsushi, Suzuki, Masato, Osuo, Junya, Edao, Yuki, Fukada, Satoshi, Yamanishi, Toshihiko, Oya, Yasuhisa, Okuno, Kenji
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 01.08.2012
• ISSN: 1536-1055; 1943-7641
• DOI: 10.13182/FST12-A14112

Tritium release behavior for thermal neutron-irradiated Li 0.17 Pb 0.83 eutectic alloy was studied. Main tritium release peak was observed in the temperature just a little higher than melting point in a thermal desorption spectrometry (TDS) experiment. Most of tritium release from Li 0.17 Pb 0.83 eutectic alloy was found to be governed by diffusion process from the results of isothermal annealing experiments. Tritium diffusivity in a liquid state of Li 0.17 Pb 0.83 eutectic alloy was evaluated to be D = 4.7 × 10 -8 exp(-0.13 eV/kT) m 2 s -1 . Tritium diffusivity was increased by the phase transition of Li 0.17 Pb 0.83 eutectic alloy from a solid state to a liquid state, resulting in the sharp tritium release peak that appeared in TDS spectrum. In addition, about 4% of tritium was trapped in Li 0.17 Pb 0.83 eutectic alloy as Li-T bond.